Unexpected threads observed before main()

[Keivan Shah]

On Monday, 1 March 2021 at 06:50:42 UTC, rikki cattermole wrote:
> Do you still get them when you call your app like this?
>
> ./app --DRT-gcopt=parallel:0

Wow, Not getting with "--DRT-gcopt=parallel:0", Thanks a lot, 
didn't know GC had a parallel option that can be 
controlled(https://dlang.org/spec/garbage.html#gc_parallel). If 
possible, Can you also help me understand that why are the 
threads not despawned once the GC is done collecting in this 
example?